Animating Depth: Tweening Movement - Flash 3D: Animation, Interactivity, and Games - page 74

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Figure 3.31 Parallax scroll over time
Figure 3.31 shows each layer's movement over time. In addition to the technical steps,
the artwork was prepared specifically to achieve the seamless scroll (refer to Figure
3.19). Each layer is a bitmap image created in Photoshop and saved as a PNG file. The
PNG file format retains the alpha channel for each layer. Parallax scrolling can also be
applied to vector artwork created in Flash. Let's see how to create the vector artwork.